Hydroturbine pump



March 24, 1931. f 1. c. JENNINGS; 1,797,980

h HYDROTURBINE PUMP Filed Jan. 19, 1929 5 sheets-sheet 1 March 24,19311. C, JENMNGS 1,797,980

HYDROTURBINE PUMP Filed Jan. 19, 1929 3 Sheets-Sheet 3 INVENTOR 151629J.' rlmzf'lzoya A TToRNEYJ Patented Mar. 24,1931 i l narran srarasrrsNrori-ica y ERVENG C. ENNING 0F SOUTH NORWALK, CONNEGTICUTnrnacauiasmn amar Appication led January 19, 1929. Serial No. 333,602;

This invention relates to thetype of hydroshowing the application of myinvention to a turbine pump shown in the prior United slightly differenttype of pump, and States patents to Nash, No. 953,222, granted Fig. 6 isasimilar detail view showing a March 29, 1910, and No. 1,091,529,granted further modification.

5 March 31, 1914. Referring particularly to Figs. 1, 3 and 4, litiIIn'the manufacture of the Nash type of l have indicated a pump which isin genpump, it has been found that theperi heral eral the well knownNash type and comprises l speed of the rotor must not exceedade nitely arotor 10 mounted on`r a shaft 11 and rblincwn rate if the efficiency ofthe pump is tatable in a casing 12. The rotor is posil@ to bemaintained. All attempts to increase tively'driven from a motor or othersuitable 60 the relative axial length of the rotor beyond source ofpower.. The rotor 10 is preferably approximately 40% of its outsidediameter of a general cylindrical shape and rotates have also been foundto produce a sharp drop within a compartment or chamber in the ineiiciency in higher vacuum operation. casing 12, which is substantiallyof elliptical @onse uently, the only practical method cross-section, thechamber closely fitting the hereto ore known for increasing the capacityrotor at the two sides thereof, as shown in of the Nash type of pump hasbeen by in- Fig. 3, and being'spaced therefrom to form creasing thediameter proportionately to any lobes above land below the rotor.increase in rotor length, and by correspond- The rotor, as is usual inNash pumps,fis

2@ ingly reducing the number of revolutions so. divided by substantiallyradial vanes in a 70 as to maintain the same peripheral. speed of seriesof rotor pockets or compartments, each the rotor. This method, ofincreasing cahavinga port or opening at the bottom. The pacity involvesincreases in weight andmotor casing 12 is provided with an inlet 13,consize out of all proportion to thej gain in canected through an inletpassage 13a to inlet S5 pacity. Y f ports 14. v 'F5 The principal objectof this present vinvenln vthe preferred form, the walls of the tion isto provide means permitting widenrotor chamber are extendedinward toform ing of the pumpv rotor and thus securing adconical hub portions 25,provided with openditional capacity without reducin the eci- Iings 28connecting the inlet ports 14 and s@ ency of the pump. A more speci cobject is passages 14a with the otor pockets. Addi- 80 tc provide means,as a separating member, tional openings 28 connect therotor pockets forstopping the surging of the water in the with. passages 15a anddischargev ports 15, lobes o" the pump casin whereby the lengthconnected by an outlet passage16 to the pump cf the rotor may be sustantially increased outlet 17.

while maintaining or increasing the eiiiciency ln the 'operation ofpumps as thus far de- 35 i of the pump. @ther objects and advantagesscribed, it has been found that tlie axial cf the invention will behereinafter described vlength -of the rotor cannot substantially exandmore particularly pointed out in the apceed 40% of its outside .diameterwithout f pended claims. y reatly reducin the efficiency of the-pump. 4@Certain forms and modifications of the'int appears pro able that thisreduction in 9 venticn are shown in the drawings, in .which eliciency onincrease of'length is due to the ligl is the longitudinal sectional.elevasurging of the water axially in the elliptical -ticn cfa pumpembodying my improvements, lobes or spaces surounding the rotor in the'taken on ine 5 5, F1g. 3. upper and lower portions of the casing.

Fig. 2 is a partial elevation similar to Fig. In order to reduce orprevent this surging 95 1, but showin a slight modification; action, Ihave provided one or more separat- 3 andg4 are transverse sectional ele-4ing members 20, preferably formed integral -vations, taken-along thelines 3-3 and 4 4 .on the inside of the casing in the elliptical inFig-1'. portions thereof and extendin inward closel Fig. '5 is alongitudinal sectionalelevation yadjacent to 'the periphery o the rotor.

size can be operated.

When such a separating partition is .pro-

A vided, it is found possible to very substanti.

ally increase the length of the rotor relative to its out side diameterwithout loss of eliticiency. It is thus possible to correspondinglyincrease the capacity of the pumpby merely increasing the length thereofand withou change in the peripheral speed.

I also find it desirable to provide a corresponding separating member 21(FigL 1) in the hub portion of the rotor itself, this separating member2l strengthening the vanesl of the rotor and also co-operating with theseparating members 20 in reducing cross cur-v rents within the pocketsof the rotor.

In Fig. 2 I have indicated a separating member 24 in the rotor extendedoutward substantial to the periphery of the rotor to still furtherdecrease the cross currents.

In Fig. 5, I have indicated the use of the separating members 20a in aslightly different type of pump, in which the ports 30- are formeddirectly in the rotor chamber end walls, instead of being formed inextended hub portions of` the casing. The action and the advantages ofthe separating members 20a are the same as previouslydescribed.

In Fig. 6, I have indicated the additional -use of separating members2lb in a pump of the type shown in Fig. 5.

In all forms of the invention illustrated,

the apparently'simple change over previous practice by inserting theseparating members in the casing lobe or lobes, or in the lobe or lobesand alsoin the rotor, has been found to produce very remarkableincreases in eficiency and also great economy in manufacture. It hasbeen found, for instance, that the capacity of a certain size pump canbe increased by this method with a saving of at least one-third inweight of metal over a pump of the same capacity but with a largerdiameter and narrower rotor, and with areduction in motor size due tothe increased speed at which the longer pump of smaller the advantagesthereof, I do not'wish to bey limited to the details herein disclosedotherwise than as set forth in the claims.

What I claim is: y o 1. In a hydro-turbine pump of the type using wateras a seal and havlng ports', and displacement chambers coo erating withsaid ports, the combination o a circular rotor with an elliptical casingtherefor and means to prevent the surging of the water in an' axaldirection comprising a projection extending in from the peripheralcasing toward the rotor.

using water as a seal and having ports, and displacement chamberscooperating w1th`sa1d.

- v 2. In a hydro-turbine pump of the type ports, the combination of acircular -rotor with an elliptical easin therefor and` means to preventsurging of tie Water in an axial direction along the space outside ofthe path of the rotor comprising a separating member projectingtransversely inward from the casing toward the rotor in said space. 3.In a hydro-turbine pump of the type using water as a seal and havingports, and

displacement chambers cooperating witht'said ports the combination witha rotor and a casing in which said rotor is located, said i Casinghaving a lobe of greater diameter than the rotor, of means to reduce theaxial surging of the water in the lobe of the pump coinlli.

prising a separating member located withinv the casing in said lobe andbetween the ends 'l f said casing. f

l 4. In a hydro-turbine pump of the type 'using water as a seal (and-having ports, and

displacement chambers cooperating with said ports, the combination witha rotor and a cas` ing in which said rotor is located, said casinghaving a lobe of greater diameter than the rotor, of meansto reduce theaxial surging of the water in the lobe of the pump com# ,prising aseparating member located within the casing in said lobe and between theends of said casing, said member extending inward closely adjacent saidrotor.

5. In a"hydroturbine pump, the combination with -an elliptical casing ofa cylindrical rotor contained within the casing, whereby the casing hasportions spaced from the rotor on opposite sides, of means to preventthe flow of water longitudinally of the pump comprising a separatingmember extending in from each side of the casing substantially half waybetween its ends toward the rotor, whereby the eiiiciency of the pump ismaintained when the relative length of the rotor is increased.

6. In a hydro-turbine pump of the type using water as a seal and havingports, and displacement chambers coo erating-.withi said ports, thecombination wit an elliptical casing of a rotor contained. within thecasing, whereby the casing is spaced from the rotor' on opposite sides,of means to restrict the `longitudinal fiow of water in the casingcomprising separating members extending in from eachside of the casingtoward the rotor -tojprevent the flow of the water longitudinallythereof, and a separating member extending outwardly from the hub oftherotor substantially in registrationwith the first named members.

. 7. In a hydro-turbine pump of'the type using water as a seal andhaving ports, and

. displacement chambers cooperating with said ports, the combination ofa' circular rotor t with an elliptical casing therefor, of means torestrict the surging of the water in an axial direction comprising meansextending transversely of the casing 1n the space between the peripheralcasing and the path of the rotor.

8. In a hydro-turbine pump of the type using'water as a seal and havingports, and displacement chambers cooperating with said ports, thecombination of a circulahrotor with an elliptical casing therefor, ofmeans to reduce cross currents in the pump comprising a continguousbaliewall located in the central part of the enlargement between the sidewalls of the pump 7and projecti/n 'into the chamber between the surfacepasse over by the extreme edge of the rotor and the 1l periphery of thehousing.

.9. Ina hydro-turbine pump, Vthe combination of a circular rotor with anellipticalcas-l ing therefor, 'of means to reduce cross currents withinthe casing and within the pockets of the rotor comprising a contiguousbaille wall located in the central part of the enlargement between theside walls of the pump and projecting into the chamber be tween thesurface passed over by the extreme edge of the rotor and the peripheryofthe housing, and another baile walllocated in the' upperportion oftherotor to cooperate with said first mentioned baile wall f In testimonywhereof I have hereuntov afl fixed my signature.

A IRVING JENNnvGs

